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The HfFe 6 Ge 6 -type YMn 6 Ge 6-x Ga x solid solution (0.25=<x=<2.00) has been studied by magnetization measurements. The low Ga content compounds (x=<0.75) behave as antiferromagnetic (475=<T N =<404 K). The Ga-rich compounds (1.25=<x=<2.00) are ferromagnetic (352=<T c =<310 K). The intermediate compounds display metamagnetic behaviour with rather weak threshold fields (H t <0.5 T). The moments deduced from the maximum magnetization values in the ferromagnetic state are close to 1.8 μ B per Mn atom. The evolution of the magnetic properties with Ge substitution is discussed.